Floating microscopic heterotrophs are mostly grouped as
phytoplankton
zooplankton
microbes
nekton
Correct answer is B
Phytoplankton are microscopic marine organisms that sit at the bottom of the food chain, most phytoplankton are buoyant and float in the upper part of the ocean. However, they are not heterotrophic like the zooplanktons.
microbes are living organisms around us that we can't see with our naked eyes.
nektons are organisms that are able to swim and move independently of current.
The biological association that contributes directly to succession in a community is
competition
predation
parasitism
commensalism
Correct answer is A
competition between species in a particular habitat is a biotic factor of ecological primary succession.
A group of organisms of different species living in a particular area is described as a
colony
community
population
niche
Correct answer is B
A community is formed by populations of different species living together and interacting with each other. A community forms an ecosystem by its interaction with the abiotic environment.
free-central placentation
axile placentation
parietal placentation
marginal placentation
Correct answer is C
No explanation has been provided for this answer.
The ability of the eyes to focus on both near and distant objects is termed
image formation
refraction
hypermetropia
accommodation
Correct answer is D
The ability of the eye to focus on distant and near objects clearly on the retina of the eye is called accommodation. When our eyes see distant objects then the ciliary muscles relax and the focal length is maximum in this position.